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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afb290eba91996f1c839856c4b40e1dea99cf978d8a9949bfafe8c72d217c3f8' 
  AND token = 'lZkgiYsh5AFd1QEFR3MGvXlO2nmYzUY0RHp7zPXuumE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}